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Weighted Average Exercise Prices for Options Granted and Exercisable and Weighted Average Remaining Contractual Life for Options Outstanding (Detail) - Incentive Stock Option Plan - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 472,783 541,905
Number of Shares, Vested/Expected to Vest 472,783 536,531
Number of Shares, Exercisable 472,783 332,684
Weighted Average Exercise Price, Outstanding $ 9.38 $ 9.33
Weighted Average Exercise Price, Vested/Expected to Vest 9.38 9.31
Weighted Average Exercisable, Exercise Price $ 9.38 $ 7.97
Weighted Average Remaining Life, Outstanding 57 months 67 months
Weighted Average Remaining Contractual Life, Vested/Expected to Vest 57 months 67 months
Weighted Average Remaining Contractual Life, Exercisable 57 months 49 months
Intrinsic Value, Outstanding $ 4,853 $ 5,321
Intrinsic Value, Vested/Expected to Vest 4,853 5,280
Intrinsic Value, Exercisable $ 4,853 $ 3,719